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Optimal needle design for minimal insertion force and bevel length.

Yancheng Wang1, Roland K Chen2, Bruce L Tai2

  • 1State Key Lab of Fluid Power Transmission and Control, Zhejiang University, Hangzhou, 310027, China; Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA.

Medical Engineering & Physics
|June 25, 2014
PubMed
Summary

Optimizing needle geometry for brachytherapy reduces insertion force by 11% and bevel length by 46%. This model-based approach enhances needle guidance and minimizes deflection during procedures.

Keywords:
Genetic algorithmInsertion forceLancetNeedleOptimization

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Area of Science:

  • Medical Devices
  • Biomedical Engineering
  • Surgical Instrumentation

Background:

  • Minimizing needle insertion force in brachytherapy improves guidance and reduces deflection.
  • Lancet-tipped needles are commonly used, but their geometry can be optimized.
  • Current needle designs may not achieve optimal force or length characteristics.

Purpose of the Study:

  • To develop and validate a methodology for optimal needle geometry design.
  • To minimize insertion force and bevel length for lancet-tipped needles.
  • To enhance needle performance in brachytherapy applications.

Main Methods:

  • Mathematical modeling of cutting edge angles and insertion force.
  • Development of a predictive model for needle insertion force.
  • Utilization of a genetic algorithm for needle geometry optimization.
  • Experimental validation using ex vivo porcine liver models.

Main Results:

  • Optimized needle design reduced insertion force by 11% while maintaining bevel length.
  • Alternative optimized design decreased bevel length by 46% under equivalent force.
  • Experimental validation confirmed the effectiveness of the model-based optimization.

Conclusions:

  • Model-based optimization provides an effective approach for designing improved brachytherapy needles.
  • Optimized needle geometry can significantly reduce insertion force and bevel length.
  • This methodology has the potential to enhance patient safety and procedural outcomes in brachytherapy.